/* eslint-disable eol-last */
/* eslint-disable no-undef */
/* eslint-disable indent */
/* eslint-disable space-before-function-paren */
/* eslint-disable eqeqeq */
import {
    baseUrl
} from './env'

export default async(url = '', data = {}, type = 'GET', method = 'fetch') => {
    type = type.toUpperCase()
    url = baseUrl + url

    if (type == 'GET') {
        let dataStr = '' // 数据拼接字符串
        Object.keys(data).forEach(key => {
            dataStr += key + '=' + data[key] + '&'
        })

        if (dataStr !== '') {
            dataStr = dataStr.substr(0, dataStr.lastIndexOf('&'))
            url = url + '?' + dataStr
        }
    }

    if (window.fetch && method == 'fetch') {
        const requestConfig = {
            credentials: 'include',
            method: type,
            headers: {
                Accept: 'application/json',
                'Content-Type': 'application/json'
            },
            mode: 'cors',
            cache: 'force-cache'
        }

        if (type == 'POST') {
            Object.defineProperty(requestConfig, 'body', {
                value: JSON.stringify(data)
            })
        }

        try {
            const response = await fetch(url, requestConfig)
            const responseJson = await response.json()
            return responseJson
        } catch (error) {
            throw new Error(error)
        }
    } else {
        return new Promise((resolve, reject) => {
            let requestObj
            if (window.XMLHttpRequest) {
                requestObj = new XMLHttpRequest()
            } else {
                requestObj = new ActiveXObject()
            }

            let sendData = ''
            if (type == 'POST') {
                sendData = JSON.stringify(data)
            }

            requestObj.open(type, url, true)
            requestObj.setRequestHeader('Content-type', 'application/x-www-form-urlencoded')
            requestObj.send(sendData)

            requestObj.onreadystatechange = () => {
                if (requestObj.readyState == 4) {
                    if (requestObj.status == 200) {
                        let obj = requestObj.response
                        if (typeof obj !== 'object') {
                            obj = JSON.parse(obj)
                        }
                        resolve(obj)
                    } else {
                        reject(requestObj)
                    }
                }
            }
        })
    }
}